Lubricants such as silicone oils can be included in them, to make the damaged surfaces of ball-bearings that have run out of oil more slippery, so that they are not scratched too rapidly.

比如硅系列油等润滑剂，可以使耗尽了油的滚珠轴承的受损表面更加光滑，避免过快摩擦。